GAX 8.1.2 PA has some information:
Operational Parameter Management (OPM)—Operational Parameter Management provides the ability to create a user-friendly interface for business users, with data validation, that enables the management of operational parameters. Operational parameters are stored as key-value pairs in Transaction objects (Lists). These operational parameters can be used as input to routing strategies, voice applications, and Genesys Rules that enable a business-user to modify the behavior of routing without the need to change the associated application. For example, business hours and greetings can be defined as operational parameters. The business user can change these in OPM in a safe and controlled manner without the need to modify the routing strategy or the voice application.
Audio Resource Management (ARM)—Audio Resource Management provides a user-friendly interface for business users to manage greetings and prompts by enabling you to upload pre-recorded greetings. It is completely integrated with Operational Parameter Management. When you upload a greeting, Genesys Administrator Extension automatically converts the WAV (.wav) file to u-law, a-law, and gsm formats, and transfers the encoded files to the file server that is used by media server, thus making these files immediately available for use.